Anyone know what that small cylinder sensor or valve on the firewall is? It seems to have a vacuum line connected to the intake manifold down to something behind the motor. It's located to the right of the fuel filter. I tried looking it in the work manual but can't find anything. Plus the numbers on it aren't helping "SM4" "9k22" Just wondering cause the one on my car is destroyed for some reason. Looks like the previous owner hit it with a hammer haha.
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